Filter



Feb. 22, 1938.

w. P; VDALRYMPLE 2,108,798

FILTER Filed Nov. 3, 1953 3 Sheets-Sheet l Yr" wam Home 5 y Feb. 22, 1938. w. Pi DALRYMPLE. I'2,108,798

FILTER Filed Nov. 3, 1933 3 Sheets-Sheet 2 Parenteel Feb. 22, 193s UNITED STATES PATENT OFFICE I 2,108,798 rmrnn william P. noie, ohioogo, ru 1 Application November a 193s; senior No. 696.475

(el. 21o-1er) ybuilt-up pressure having been produced by the e 15 Claims. My invention relates to iilters of a type com;

prising e altering medium through which the fluid to be cleaned is passed under press and the device as shown is designed particularly for use for filtering the oil functioning in the crank case and associatedbearings of an automobile. It is 'the object of my invention to provide a. new

and improved form and arrangement of parts by the operation of whichzthe filtering medium is subjected to a cleaning operation from time to 4 time in the use of the filter or from time to time in the ordinary use of the automobile-on which the iilter is mounted, preferably by automatic action controlled by the use of the filter or the car.

It is one of the objects of my invention to provide an improved arrangement of this type in which a reversal of themdirectiorr of ow of the liquid being iiltered through the filtering medium is produced at intervals whereby the dirt and. grit which have gathered on the iiltering medium shall be iiushed loose and washed down so as to settle out of the path of movement of the liquid to the iiltering medium, the arrangement'being such that there shall be no danger that such dirt shall later iind its way again either into the path of the liquid to` the filtering medium. or into the path o-f the'liquid to the outlet means thro-ugh winch clean'y oil 'normally is delivered. It is the further object of my invention to provide an improved arrangement of this type by which a cleaning operation shall be effected aucompression of a quantity of air or other compressible means within the iilter.

It is one of the objects of my invention to provide in a device of this. type `an improved arrangement of housing means and communieating valves whereby a quantity of air trapped within the filter is compressed during the use 'of the filter so as to be ready after the use of the lter has terminated to expand and effect `the desired cleaning ofthe iilterlng medium,

It is one of the objects of my invention to give the several parts such an improved arrangement and location withy respect to each other as to causenI minimum of disturbance of the collected dirt and grit during the functioning of the filter for euvering cleaned liquid, `the oieoning of the filtering lmedium being preferably effected at a time when the normal functioning of the filter has stopped.

It is another object of my invention to provide an auxiliary ltering member which shall deiinitely prevent the escape of the collected dirt and grit from the receptacle during the operation of cleaning' the principal iiltering medium.

It is one of the objects of my invention to provide an improved 'arrangement comprising a tomatically each time when the flow of liquid tothe inlet chamber of the lterfis stopped, either by reason of a. stoppage of the motor or otherwise, such cleaning operation being controlled preferably by the changes in the pressure upon the liquid in the feed line to the filter.

To this end,l it is one ofthe objects of my invention to provide improved means controlled by the pressure o-f the liquid in the feed line for regulating thevdirecti'on of o-w of vthe -liquid through the filtering medium either by a change in the connections through which the liquid passe-s to! or from the filter or otherwise. It is one of theI objects of -my invention to provide pressure valve in the outlet mean-s through which the cleaned liquid normally escapes from the lilter for insuring that the desired degree of'pressure shall be built up in the lter during the delivery ofliquid to the lter for being cleaned,

whereby the'desired expansion eect may be obtained when the delivery ofliquid to the lter ceases. 4 i It is another object of my invention to pro vide an improved arrangement comprising'twb' or more separate filtering mediums of different types or different characteristics otherwise whereby they shall offer different degrees of re l sistance to thepassage-of the'liquid to be iilltered, and to provide in such arrangement a suitable form of pressure valve in connection an improved arrangement of this type in which with onev or the other of said filtering mediums for providing the desired differential action. It is another object of my invention to provide a.

by-pass arrangement whereby liquid delivered tothe filter cangbe passed through the iilter with` out going through the filtering'medium in case unexpected resistance to the passage of the liquid through the filtering medium should be ene countered. y l It is another object of my invention to iniprove devices of this type in sun details hereinafter pointed out. The vpreferred means by are illustrated in the accompanying drawings and are hereinafter specically described. That which I believe to be new and desire to cover by this application is set forth in the claims.

In the drawings.- i

Fig. 1 is a central vertical section through one form of my improved filter;

Fig. 2 is a view showingv a fragmentary portion of the construction as shown inv Fig. 1 but with the parts in changed position;

Fig. 3 is a central vertical section through a modified form. of lter;

Fig. 4 is a central vertical section through another modiiied form of construction; and

`Figs.,5 and 6 are views similar to portions of Fig. 4 but showing a changed position of certain 'of the parts.

Referring now to Figs. 1 and 2, in which cor-- responding parts are indicated-by the same ref-f erence characters, I and II indicate twovconnected parts making up a receptacle closed at its lower end by a removable plug I2. The interior of the receptaclefis divided into nan inlet chamber I3 at its lower end and an outletchamber I4 at its upper end, the partition eecting such division comprising a ring I5, a plate I3 and a' iiltering medium I1 in the form of a felt sleeve connected with the ring I5 at its lower end and with the plate I6 at its upper end. A grille comprising rings I8 and I9 connected by a series of bars 2li is locatedwithin the sleeve I1 making up the filtering medium for holding such sleeve expanded into substantially cylindrical form.

A 'baille plate '2I in the form of a cylinder is secured atl its upper end to the plate I5 so as tov be closed by said plate and so as to form with said lplateau inverted dished member, such cylinder extending downwardly in'side of the filtering medium I1 and the grille 28 in spaced relation thereto, beingV provided with an Out- Wardly extending flange 22 at its lower end..

VMeans is provided for delivering liquid under pressure into the inlet chamber I3 .comprising a valve whose body 23 is secured within thecylinl dei` -2I at'its upper end, a nipple 24 on said body portion extending upwardly through the plate I6 and through thet'op wall of the receptacle member I0 to both of which it is connected by means of nuts secured by means of screw threads 0n the outer-face of the nipple. The body portion 23 of the valve is in the form of a housing havingA an opening 25 through'the side wall near its upper end, such opening being extended also through the wall of the cylinder 2 I The housing is provided also with an opening 25 into the`inlet chamber I3 within the cylinder 2I anda second opening 21 near its lower end adapted for the connection of a pipe 28 thereto ashereinafter described. The lower end of the housing 23 is open, being .provided with'a pih 29 therethrough forming a' support.vv for a coiled spring 30 which serves normally to `hold a slide valve 3| in raised position as s hown in said Fig. 1. At an intermediate point, the slide valve 3| is provided with a circumferential groove 32 with which an open- ,ing 33. through the wall of the valve communi-- cates, .the inner endvof the opening 33. being in communication with a central bore 34 at the upper end portion of the valve.

As is clearly shown -in Fig. 1, the pipe .28 is upwardly directed at -one end so as to extend through suitable openings in the plate I6, and they top wall of the casing member I0 to both of which parts the pipe is connected by means of suitable nuts secured in position .thereomby means of screw threads.' A pipe 35 extends downwardly through a suitable opening in the top wall of the casing member Ill so as to open infairly close proximity to the plate I6, said pipe being secured "in position by means of suitable nuts secured.

thereon by means of screw threads. At its lower nected with the discharge' side of the oil pump of the automobile. The pipe 35 is connected with theubear` gs of the car, constituting the principal out et means for the filter, and the pipe 28 constituting an auxiliary outlet means is connected with the y*crank case of the engine, all as will be readilyunderstnod.

When oil is delivered under pressure downwardly through the nipple 24 f om the oil pump, the pressure of the oil upon e valve `3I forces the valve downwardly against the action of the spring 30. When the groove 32 inl the valve 3| comes into registry with-the opening 28 through the housing 23 of the valve, a small quantity of oil is delivered through the bore 34, the opening 33 and the opening 2 directly intothe inlet chamber I3 ofthe filter'. As the valve 3l continues inits downward movement by reason of the pressure of the oil on its top face, the groove 32 is carried out 'of registry with the opening 28 so as very quickly to shut oil th delivery of oil through said opening. When the parts reach the position as shown in Fig. 2, the oil coming down. wardly through the nipple y24 passes. directly through the opening 25 into the inlet chamber AI3 adjacent to the inner or inlet chamber face of the filtering medium I1A through'which the .oil is forced under pressure for escape through the pipe 35 leading .to the'bearings of the car. Inasmuch as-it requires a considerable pressure to force the oil through the pipe 35 and through the communicating bearings at the desired speed outlet chambers I3 and I4, serving to compress the air within the upper end portion of each of said chambers. I have indicated in dotted lines approximately the level of the top surface of the oil within each of the chambers I3 and I4, such dotted line in the outlet chamber being indicated by the numeral 39 while the dotted line indicating the level of the liq'uid in the inlet chamber is indicated by the numeral 40. As will be readily understood, the pressure condition continues and remains substantially constant during the normal delivery of oil through the inlet means comprising the valve arrangementas show n. When,

however, the delivery of oil through the inlet means ceases, the valve 3I returns to its normal position as shown in Fig. 1 under the iniiuence of the spring 30. With the valve in thev position as shown in Fig. 1, the oil is freeto move directly upwardly through the open lower end 'of the body 23' of the valve and through the opening 21 and the pipe 23 t0 the crank case of the automobile, such movement of oil being caused by the exf pansion ofthe air trapped in the. upper ends of the inlet and outlet chambers .I3 and I4. As will in connection'with the ordinary automobile' en-n be readily understood, when the compressed air in the upper end of the outlet chamber I4 expands so as to relieve the pressure within the receptacle, a substantial amount of oil is caused to flow in the 'reverse direction through the yiiltering medium I1 from the outlet chamber into the inlet chamber so as to escape through the pipev 28 to the crank .case of the engine. Such oil is caused to pass downwardly about the' lower edge of the cylinder 2| and then to pass upwardly through the filtering medium 36 for access to the lower end of the valve for escape through the pipe 28.

, During the normal operation of the car by which normal use of the lter is brought about, the oil passes in considerable quantities through the filtering medium I1 from the inside out, depositing the dirt and grit upon the in ner or inlet chamber face of the filtering.,v medium I1. When av considerable ilow of oil in the reverse direction is effected through theltering medium. the dirt and grit are loosened from the inner face of the iiltering medium and are washed down therefrom so as to settle in the lower end of the inlet chamber I3. Inasmuch as this cleaning operation takes place at a time when the delivery of oil to the filter `has ceased, the dirt and grit are permitted to settle into or towaid the bottom of the inlet chamber I8 entirely out of the path of movement of the oil to the pipe or to t e pipe 28. The oil which passes through th filtering medium I1 in the reverse direction and thence downwardly about the edge of the cylinder 2| for escape through the pipe 28 is prevented from carrying any of the dirt and grit from the sludge portion of the inlet chamber by reason of its passagethrough the filtering medium 36. The dirt and grit which gather on the bottom face of the filtering medium 36 by reason of the passage of oil upwardly through it are loosened and discharged more orless completely by a slight reversed l flow through vsuch filtering medium brought about by the delivery .of oil into thev 'upper portion' of the inlet chamber through the opening 26 as above described when the valve,l is forced upwardly through the pipe 58, such liq- 45 moves downwardly. l

'The inlet chamber I3 is to be of any desired size or depth consistent with the provision of `a fairly deep settling chamber portion. I have found in practice that the parts may be xriade of suitable size without unduly lengthening the filter asa whole so as to be available conveniently gine. By reason of the systematic cleaning of the filtering medium at fairly short intervals, the filter maybe made' to carry the full ow of oil from the pump, the Acleaned filtering medium of fairly small area being capable of cleaning, the

'full flow oi oilefciently without the develop' ment of undue pressure within the filter.

When it is desired to clean the sludge chamber portion of the inlet chamber I3, this is eiected by a removal of the plug I2l so as to vpermit a quantity of oil within the chamber to wash the collected dirt .and grit downwardly'. I have found in practice that with a receptacleoi moderate size it is not necessary that the sludge .chamber be cleaned out oftener than once or twice a year for a-travel of ten or fifteen thousand miles under ordinary conditions.

In the arrangement shown in Fig. 3, a recepta'cl-e comprising a top section 4I and a'bottom section 42 is used, a screw-threaded plug 43 being employed for closingv a drain opening 44 at the lower'end of the receptacle. The interior of. the

receptacle is divided into inlet andoutlet lportions 45 and 46 by means comprising an inverted dished member 41, a second inverted dished memvber 48 inside of said member 41, a plate 49 above the member 48, a series of felt rings 50 forming a vertical cylindrical wall betweenthe member 5 48 and the plate 49,I and a sleeve 5I connecting .the space above the dished member 41 with the space between the member 48 and the felt rings 50, such latter space forming thus through the sleeve 5I 'an extension of the outlet chamber 46. 10 The felt rings 50 are supported in extended position by means of a grille formedof rings 52 and upright bars 53.

Outlet means is provided leading from the outlet chamber 46 comprising a sleeve 54 having 15 screw-threaded connection with the wall of the section 4I ofthe receptacle, such sleeve 84 being provided with an outwardly opening valve 55 in the formpf a ball yieldingly held in position by'a coiled spring 56.v An outlet pipe 51 is'connected 20 with the outer end portion of the sleeve 54.

Inlet means is 'provided in communication with the inlet chamber 45 for introducing liquid undery pressure into the inlet chamber, comprising a. pipe 58 connected at its lower nd with a fitting 25 59.by which the pipe is held i fixed position in an opening through the wall of the lower member 42 of the receptacle casing', theupper end of the pipe 58 being connected by means of screw threads 'with a valve casing 68 which in turn is 30 provided `with a nipple 6I which extends through a suitable opening in thetop wall .of the dished member 48 and is secured by means of screw threads in anopening in the plate `49. The valve casing 60 provides an opening upwardly into the 35 I inlet chamber 45 above the plate 49, and an opening downwardly into the inlet chamber inside of the dished member' 48. -An upwardly opening ball valve 62 prevents movement of liquid downwardly into the pipe 58 from the space above 40 the plate 49, and a ball valve 63 prevents move- I`ment of liquid outwardly from the pipe 58 into the space within the dished member 48.

When oil, water, or other liquid to be filtered uid is forced upwardlynnto the inlet chamber 45 above the plate 49. From' this position, the liquid passes to the outer face yof the filtering mediumfcomprising the felt rings 50 and is forced through suchfiltering medium in'to the extension of the. 50

outlet chamber about the member 48 and thence upwardly through the sleeve 5I for escape vthrough the outlet'sleeve 54 and pipe 51. The

spring 66, lis of suicient strengthto prevent the escape of liquid through the casing 5 4 until a pre's- 55 sure condition has been established withinthe inlet and outlet chambers 45 and 46. As will be readily understood, if the pipe 51 is connected with the, bearings of an automobile in connection with the use ci the filter for cleaning the crank 60 case oil, the spring-66 will .not ordinarily. be of any considerable strength since the resistance to the 'new of the on thrugh t e bearings is sumin connection with some makes of automobile.

At the same time, a limited amount of oil may possibly be passing outwardly from the outlet chamber 46 through the outlet sleeve 54 and the outlet pipe 51 through the bearings. I have found in practice, however, in connection with a iilter of this type used on an automobile having chamber 45 from which the oil escapes past the ball valve 63 and downwardly along the inlet pipe 58, the resistance being smaller Jthrough the pump than through the bearings. Such backward movement of the oil through the Viiltering rings 50 causes the dirt and grit to be freed -from the filtering medium so as to settle into the lower end portion of the inlet chamber45. AInasmuch as the movement of the oil backwardly through the filtering medium 50 takes place over a comparatively large expanse of surface, it will be appreciated that the contents of the inlet chamber 45 are stirred up very little if at all by the receipt of additional oil into the. inlet chamber so that there is very small probability that the oil passing downwardly and inwardly about the lower edge of the dished member 48 will carry any of the dirt or grit upwardly to the valve 63 and out through the inlet pipe 58. By reason of theslow movement of the oil and the relative position ofthe parts, .the oil passing upwardly for escape' through the valve will be clean oil while the dirt and'grit will settle to or toward the bottom of the inlet chamber.

In the arrangement shownin Fig. 4, I have provided a top casing member 86 and a bottom casing member 81 havingan outlet opening at its lower end closed by a`screw-threaded plug 88.

Across the lower end portion of the receptacle I have provided a conduit 89 held in position by means of sleeve members 90 and 9| at its opposite ends, such sleeve member 90 forming the means.

for connectingan inlet pipe 92 from the pump of an automobile to one end of the conduit and the sleeve 9| serving as the means for connecting an auxiliary outlet pipe 93 to the other en d of the conduit, the pipe 93 serving as a connection between the conduit and the crank case of the automobiles Near its upper end, I have provided a plate 94 serving to divide the receptacle into inlet and outlet portions, the portion above the plate 94 comprising an outlet chamber 95 and -the portion below the plate except as hereinafter described comprising an inlet chamber 96, the conduit 89 beinglocated within said inlet chamber. In the arrangement shown, an outlet chamber extension 91 is provided comprising an inverted dished member 98, a transversely disposed plate 99, a filtering medium in the form of a sleeve connecting the plate 99 with the lower end of the dished member 98, and a sleeve |0| connecting the plates 94,and 99 so as to cause the extension outlet chamber portion to communicate with the outlet chamber 95 proper. In the arrangement shown the lter member |00 is held in extended condition by a coiled spring |02 fitting snugly therein.-

Within the dished member 98, I have provided a second dished member |08 of smaller size so) as to stand in spaced relation tothe member 98, the lower edge portion of the member |08 being connected by a ilne screen 'member |04 with the upper end portion of the member 98,

such screenl member being reenforced and strengthened by a coiled spring |05 iitted therein.

By the provision of the dished member |02 and the screen |04, I have provided an auxiliary outlet chamber |06. In the arrangement shown the auxiliary outlet chamber |06 is connected vwith the extension outlet Jchamber portion 91 by means of a sleeve |08 in which a ball valve |09 is provided which is adapted to open upwardlyagainst the forc oi a spring ||0 seated in said sleeve.

The conduit 89 is provided with two openings and ||2 in its upper wall, the opening ||2 being in communication with a pipe ||3 'which opens near the upper end of the inlet chamber portion located within the dished`member |08. 'I'he opening is providedI with a pipe 4 extending upwardly through the members |03 and through the plate 99 being eiected through the medium of a fitting ||5 which is provided with an upwardly opening ball valve I6.

Within the conduit 89, I have provided a slide valve ||1 which in the varrangement shown is in the form of a shell. A spring |8 bears at one end against the valve ||1 and at its opposite end against the sleeve 9|, serving to hold the valve ||1normally in the position as shown in Fig. 4 so as to 'close the-lower end. of the opening the valve in such position standing clear of the opening |12. Within the shell of the valve ||1, I have provided a ball valve I|9 which is held by a spring |20 in position to close an opening |2| in the end of the shell, the ball valve ||9 and the valve both closing toward the left in said Fig. 4. A ring |22 in ilxed position within the conduit serves to limit the motion of the valve ||1 toward the right in said iigure.

The primary outlet opening from my improved filter-"is provided' through the medium of a sleeve |23 adapted to be connected bya pipeV |24 with the bearings for lubrication by the crank case oil.

A ball valve |25 opening toward the right in Fig.

The 011 deuvered through the pipe 92 is thus' forced upwardly through the pipe ||4 and past lthe ball valve ||6 into the inlet chamber 96 above the plate 99. Such oil is then'forced inwardly through the iilteringmedium |00 into the outlet chamber extension 91 and thence through the sleeve |0| and out through the principal outlet means |23 pastthe ball valve- |25 to the bearings. The filtering medium |00 is preferably inthe form of a felt sleeve 'which serves effectively for filtering the oil when the oilbecomes heated by the action of the motor. When- 'the oil is cold, however, the iiltei'ing medium |00 of felt provides very strong resistance against the passage of the oil therethrough. Under such i .the screen |04 into the auxiliary outlet chamber |06 and thence upwardly through the sleeve |00 past the ball valve |09 for escape through the s1eeve|0| and the outlet means comprising the pipe |24. It will be understood, of course, that the oil can pass through the screen |04'only upon condition that it overcomes the resistance offered bythe springseated valve- |09, but I have found in practice that the oil when cold. passes more freely through a very vilnescreenso as to open a pressure valve than it does thrpugh a filtering medium of felt of such texture as to provide anv effective filtering medium forfhot oil. 'I'he spring ||0 is of course, to be of such size as to provide the/desired differential action with respect to the two ltering mediums and I 04. The arrangement 'is preferably such that the greater portion of the oil will pass through the screen |04 while the oil is cold and that then the greater portion of theoil will pass through the nltering medium |00 after the oil becomes i heated. J

By reason of the resistance to the passage of the oil through the outlet pipe |24 to the bearings, plus the resistance offered' by the spring pressure valve |25, the resistance to the entrance of the oil through the pipe 92 is comparatively great and a fairly intensive pressure condition is established within the filter. When the pressure of the oil entering through the pipe 92 against the valve ||1 ceases, by reason of the stoppage of the engine pump or otherwise, the valve ||1 is moved from the position as shown in Fig. to the position of said valve as shown in Fig.`4, servingl to close the lower end of the opening and the pipe H4 and to open the lower end of the opening H2. Under such conditions, the compressed air in the upper end of the inlet chamber 96 forces a limited amount of .oil from the inlet chamber downwardly through thepipe ||3. `At the same time, the compressed air within the outlet chamber 95 forces a substantial amount of oil outwardly in the reverse l respect to the screen |04 takes place upon each dished member |03 serves to cause a substantial flow o oil outwardly in the reverse direction through the screen |04 serving to effect a cleaning operation with respect to the screen. As will be readily understood, this cleaning effect with toppage of the delivery of oil througvh the inlet pipe 92 whether or not the screen |04 has been functioning as an auxiliary filtering medium. This is, of course, by reason .of the fact that a pressure condition is establishedy within the auxiliaryj outlet chamber |06 whether or not oil is forced upwardly past the ball valve |09. The arrangement is such that the dirt and grit cleared from the inlet chamber faces of the filtering medins |00 and |04 settle diiectlyinto the lower end portion of the inlet chamber 96 out of the path of the movement of the slow moving oil passing inwardly about the lower edges of the dished members 98 and |03 for escape into the mouth of the' pipe ||3 for delivery through the auxiliary outlet means to the crank case.

In case the pressure within the pipe '92 becomes excessive, the ball valve ||9 is adaptedto Open against the action of the spring for permittingoil to pass directly through the filter in by-pass relation to the filtering medium. The spring |20 is. to be of such strength, however, as to prevent such by-passing effect unless the pressure becomes excessive, and such that after the valve ||9 has opened to some such position as shown in Fig. 6 the pressure through the filtering mediums is still maintained at vor above the minimum normal pressure desired. 'I'he filtering is accordingly effected continuously even after the Aopening of the valve H9.

By myimproved arrangement, I- have provided an improved construction in which a pressure condition is automatically built up within' at the end of a period of use of the lter -so as l to provide for the desired-reverse ow of the liquid through the filtering medium. By my improved arrangement, I have provided 4a construction in which a comparatively very large volume of oil' may be passed through a iilter and effectively cleaned thereby through long continued. periods of normal use without the necessity for having'the size of the filter area extended beyond a normal proportion to the size of the lter casing and-without the necessity for unduly increasing the size of the strainer opennism as shown in my drawings and as above described, it is to be understood that my invention is not `limited to such forms except so far as the claims may be so limited by the prior art, it being understood lthat changes might. well be made in the construction withoutdeparting from the spirit of my invention.

1. In a lter, the combination of a receptacle, a dished member open at its lower end extending partially across the receptacle at a substantial distance above the lower end of the receptacle, means comprising a filtering medium surround- .ing said dished member in outwardly spaced relation thereto and adapted in cooperation with said dished member to divide the receptacle into inlet and outlet portions withthe ltering medium arranged in such position that the grit and dirt from the inlet chamber face thereof are adapted to settle into the lower part oi' the inlet chamberwhen released by a cleaning operation voutlet means communicating with the outlet chamber adapted to permit-liquid to escape therethrough under pressure, auxiliary outlet means opening from saidinlet chamber with its mouth located within said dished member at a point well above the lower edge of said dished member, and means for delivering liquid to be ltered into said inlet chamber outside of said dished member at about said auxiliary outlet means and that the readiustment incident to'such escape of liquid causes a, substantial iiow of liquid through said filtering vmedium in the reverse direction for cleaning the inlet chamber, outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, means for delivering liquid to be filtered into said inlet chamber under such pressure as to escape through said outlet means and arranged to cooperate with other parts at intervals when the iiow of liquid into, the .receptacle ceases to cause a. substantial iiow of liquid through said filtering medium in the reverse direction for cleaning the filtering medium, and-means comprising a second filtering edium adapted to provide an auxiliary outlet ber communicating with said iirst named utlet chamber through which second filtering medium the liquid may pass in lieu of passing through said iirst named iiltering medium and ltering medium for dividing the receptacle into arranged in such position with respect to the inlet chamber that the grit and dirt when cleaned from! said second iltering medium are adapted to'settle intothe bottom portion of said inlet chamber.

3. In a iilter, the combination oi.' a receptacle, means comprising a filtering medium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the-grit and dirt from the filtering mediumjwhen released by an operation of cleaning the iiltering medium. are adapted to settle into the lower portion of the inlet chamber, outlet means communicating with the outlet chamber adapted to pernrlt liquid to escapetherethrough under pressure, means for delivering liquid to be filtered into said inlet chamber under such pressure as to escape through said outlet means and arranged to cooperate with other parts at intervals when the ilow of liquid into the receptacle ceases to cause' a substantial ilow of liquid through said iiltering medium in their reverse direction for cleaning the filtering medium, and means comprising a second ltering medium adapted to provide an auxiliary outlet chamber communicating with said iirst named outlet chamber through which second filtering medium the liquid may pass in lieu of passing through said iirst named ltering medium and arranged in such position with respect to the inlet chamber that the grit and dirt when cleaned from said second ltering medium are adapted to settle into the bottom portion of said inlet chamber, said second filtering medium and its associated parts being adapted normallyto-resist the iiow of' liquid therethrough much more strongly than does said first named filtering medium and its associated parts. l

4. In a filter, the combination ofv a receptacle, means comprising a iiltering medium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and dirt from the ltering medium when released by an operation of cleaning the filtering mediuniare" adapted to settle into the lower portion of the inlet chamber, outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, means for delivering liquid to bq Altered into said inlet chamber under such pressure as to escape through said outlet means and arranged to cooperate with other parts at intervals when the ow of liquid into the receptacle ceases to cause a substantial iiow. of liquid through saidiilterng medium inthev reverse direction for cleaning the filtering medium, means comprising a second ltring medium adapted to provide an' auxiliary outlet chamber communicating with said rst named outlet chamber through which second illtering medium `the liquid may pass in lieu oi.' passing through said rst named filtering medium and arranged in such positionLV with respect to the inlet chamber that the grit and dirt when cleaned from said second ltering medium are adapted to settle into the bottom portion of said inlet chamber, and a pressure valve through `which the liquid must pass from said auxiliary outlet chamber to said iirst named outlet chamber arranged normally ltopreventi'low of liquid through said. second iiltering medium until the pressure of the liquid -in the inlet chamber has reached a certain predetermined maximum.

5. In a lter, the combination. 'of a receptacle having a conduit leading directly across the receptacle near lthebottom with two openings in the side of the conduit, means 'comprising a cleaning the iiltering medium are adapted to settle into the bottom portion of the inlet chamber, outlet` means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure,- means for delivering liquid to be filtered into one, end of said conduit for delivery through one of said openings in the side of the conduit into said inlet chamber under such pressure as to escape through said outlet means, a valve slidably mounted in said conduit so as to cover either of the openings in the side of the conduit alternatively, a pipe communicating at its lower end with said conduit at one of said openings and open at its upper end first named pipe While leaving the second pipe open and adapted to yield for movement of the j ,valve into position to admit liquid under pres.-

sure into said iirst named pipe, said rst named valve having a longitudinal openingv therethrough, and a pressure valve yieldingly seated in the longitudinal opening through. said iirst named valve adapted when the pressure of the liquid in said conduit reaches a certain predetermined maximum 'to yield for permitting the passage of liquid directly through said conduit in by-pass relationship to said iiltering medium.

6. In a iilter, the combination of a casing, a

and valve means adapted to close said auxiliary outlet means during the period when liquid for filtering is being delivered under pressure to said casing.

'7.'In a filter, the combination of a casing, a dished member located in inverted position transversely of the casing, a filter member in the form of a sleevegsecured at its lower end to said dished member and extending upwardly in outwardly spaced relation to the side wall portion of saidv dished member, means connecting the upper end of said lter member with the wall of the casingserving with the dished member and. the iilter member to divide the casing into inlet and outlet chambers, means for delivering liquid to be ltered to the inlet chamber at the outer face of said lter sleeve, outlet means communicating with said outlet chamber at the opposite face of said lter sleeve for taking the ltered liquid from the casing, auxiliary outlet means opening to the inlet chamber within said dished member at a substantial distance above the lower end oi said dished member whereby the liquid flowing Atoward the mouth of said auxiliary outlet means moves in the opposite direction from that in which the liquid moves in its passage through the filter means from the outlet chamber to the inlet chamber, and valve means controlled by /the pressure of the liquid being delivered to the casing for closing said auxiliary outlet means duringthe period when said liquid is entering the casing.

8. In a lter, the combination of a casing, a dished member located in inverted position transversely of the casing, a filter member in the form of a sleeve secured at its lower end to said dished member; and extending upwardly in `outwardly spaced relation to the side wall. portion of said dished member, means connecting the upper end of said filter member with the wail of the c Iing serving with the dished member and the ter member to divide the casing into inlet and outlet chambers, a second dished member in inverted position inside of said first named dished member, a second lter. member in the form of a sleeve secured at its upper end to said rst named dished member `and extending downwardly in outwardly spaced relation to saidsecond dished' memberA and connected at its lower end with the lower end of said second dished member,A a pressure relief valve opening from the space between said two dished members and discharging in communication with said outlet chamber in by-pass relation to said iirst named filter member, means for delivering liquid to be ltered to'the inlet chamber at the outer faces of said filter sleeves, andoutlet means communicating with said casat the outlet chamber faces of said lter the filtered liquid from the casing.

9. In a filter, the combination of a receptacle, Y

means comprising la lter medium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and dirt from the inlet chamber face of the ltering mediumare adapted to settle into the lower portion of the inlet chamberwhen released by a cleaning' operation from the iiltering medium` outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, other` outlet means opening from the inlet chamber at a point in such spaced relation to the path along which the grit and-dirt settle when released from-the face of the ltering medium as to prevent the grit and dirt in such movement from entering said second named outlet means and open at all times when liquid is not being delivered ,underM pressure to said inlet chamber for permitting the escape of liquid from the inlet chamber, and means for delivering liquid to be filtered into said inlet chamber under such pressure as to escape through said 'first named outlet means and so as to establish a pressure condition within said receptacle winch serves automatically when the delivery of liquid to the receptacle ceases to cause a substantial flow of `liquid through said iiltering medium lin the reverse directlonand out through said second named outlet means until the pressure in the receptacle is substantially `relieved for cleaning the ltering medium.

l0. In a iilter, the combination of'a receptacle,

Umeans comprising a lter medium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and `dirt from the inlet chamber face of the iiltering medium are adapted o settle into the lowei* portion of the inlet chamber when released by a cleaning operation from the filtering medium, outlet means Vcommunicating with the outlet chamber adapted to permitv liquid sto escape therethrough under pressure, means' for delivering liquid to beA filtered into said inlet chamber under such pressure as to escape through said outlet means and to establish a pressure condition within the receptacle, other outlet means opening from the inlet chamber adapted whendelivery of liquid under -pressure to the inlet chamber has ceased to permit free escape of liquid therethrough from the inlet chamber until been relieved, and an inverted dished member closed at the top and at the sides about the mouth of said second named outlet means and of such size as to maintain al comparatively large quantity of liquid about said mouth in position to escape through said second named outletmeans and serving by the presence of the normally clean liquid at least to delay substantially any movement of the liquid with the settling grit and dirt therein to said second named outlet. 1l. In a `filter, the combination of a receptacle@y a dished member open at its lower end extending partially across the receptacle at a substantialk distance above the lower end of,the receptacle, means comprising a filtering medium surrounding said dished member in outwardly spaced relation thereto andadapted in cooperation with said dished member to divide the receptacle into inlet and outlet portions with the filtering medium arranged in such position that the grit anddirt from the inlet chamber face thereof are adapted to settle into the lower part of the inlet chamber when released by a cleaning operation, outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough delivering llquld to be'nltered' into s ald inlet chamber outside of said dished member at about the level of the uppermost portion of Asaid dished member under such pressure as to pass through said filtering medium and to escape through said firstnamed outlet means and adapted to establish'a pressure condition within said receptacle, the.. arrangement being such that when the delivery of liquid t'o said inlet chamber has ceased the pressure is relieved by the escape of liquid through said auxiliary outlet means and that the readjustmen't incident to such escape of `liquid causes' a substantial flow of liquid through said filtering medium in the reverse direction for cleaning the filtering medium, and a second filtering medium 4having an effective location between the inlet chamber face o f said first named filtering medium and said second outlet iineans. for preventing the liquid escaping through said` 30`said dished member to divide the receptacle into inlet and outlet portions with the filtering medium arranged in such position that the' grit and dirt from the inlet chamber face thereof are adapted to settle into the lower part of the inlet chamber when released by a cleaning operation, outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, auxiliary outlet means opening from said inlet chamber with its mouth located within said dished member at a point well above the lower edge of said dished member, means4 for delivering liquid to be filtered into said inlet chamber outside of said dished member at about the level of the uppermost portion of said dished member under such pressure as to pass through said filtering medium and to escape through said first named outlet means 'and adapted to 'establish a pressure condition within said receptacle, the arrangement being. such that when the delivery of liquid tovsaid inlet chamber has ceased the pressure is relieved by the escape of liquid through said auxiliary outlet means and that the readjustmentincident to such escape of liquid causes a substantial how of liquid through said filtering medium inthe reverse direction for cleaning the iiltering'medium, and a second ltering medium extending across said dished member below said second named outlet means serv-'- ing to prevent liquid escaping through said second outlet means from carrying out with it the dirt and grit released from the first named filtering medium. l.

13. In a filter, the combination of a receptacle, means comprising a filtering medium for dividing the receptacle into inlet and outlet chambers, outlet means communicating with said outlet chamber, means for forcing liquid underpressure into said inlet 'chamber and'thence through the ltering mediun'l'and out through said outlet means, .and other means comprising valve mechanism adapted to stand yieldingly in normal position for permitting free movement of liquid under pressure out of the inlet chamber therethrough at all v aioavos times except when liquid is being forced into said inlet chamber through said; inlet means and adapted'to be moved into changed position by the .pressure of liquid entering the inlet chamber through said inlet means so as to prevent movement of liquid out of the inlet chamber therethrough when liquid is being forced into said inlet chamber through said inlet means.

14. means comprising a filter medium for dividing the receptacle into inlet and outlet chambers arranged in such relation that the grit and dirt from the inlet chamber face of the filtering me- Ldium are adapted to settle into the lower portion of theinlet chamber when released by a cleaning operation from the filtering medium, outlet means communicating with the outlet chamber adapted to permit liquid to escape therethrough under pressure, other outlet means opening from the inlet chamber at a point in such spaced relation to the path valong which the grit and dirt settle when released from the face of the filtering mea filter, the combination of a receptacle, y

dium as to prevent the Agrit and dirt insuch Y movement from entering said auxiliary outlet means and open at all times when liquid is not being delivered under pressure tosaid inlet chamber for permitting escape of liquid from the inlet chamber, means for delivering liquid to be filtered into said inlet chamber under such pressure as to escape through said first named outlet means and so-as to establish a pressure condition-within said receptacle which" serves automatically when the delivery of liquid to the receptacle ceases to cause a substantial flow of liquid through said filtering medium in the'reverse direction and out'through said second named outlet means until the pressure in the 'receptacle is substantially relieved for cleaning the lterlng medium, and a second filter member having an effective location between the inlet chamber face of said first named filtering medium and said second outlet means for preventing the liquid escaping through said second outlet means from carrying out with it the dirt and grit released fromthe first named filtering medium.

15 .In a filter, the combination of a receptacle, means comprising a filtering medium for dividing the receptacle into inlet and outlet cham'- bers, outlet means communicating with said outlet chamber, means for forcing liquid under pressure into said inlet chamber and thence through the filtering medium and out through said outlet means, other means comprising valve mechanism adapted to standyieldingly'in normal position for permitting free movementof liquid under pressure out of the inletchamber therethrough at all times except when liquid is being forced into said inlet chamber through said inlet means and adapted to be moved in to changed position by the pressure of liquid entering the inletv chamber through said inlet means so as to prevent movementof liquid out of the inlet chamber therethrough when liquid is being forced into Asaid inlet chamber through said inlet means, and a second filter member having an effective location between the inlet chamber face of said first named filtering medium and said second mentioned outlet means for preventing theliquid escaping through said second outlet means from WILLIAM:` P. DALRYM'PLE. 

